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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc0a7ca527da42b65695cc7c56e033d74dd1c07e00e1f2cb302d72b13665303' 
  AND token = 'atX7f1MKTKL5p63w7zlo7q1EqSQWI2Vw+wfRYCZ5vvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}